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Medium severity · published Jul 8, 2026
CVE-2026-55877
Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UX
ux · symfony
>= 2.17.0, < 2.36.1; >= 3.0.0, < 3.2.0 · source: vendor, NVD
Affected product
UX
ux
symfony
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55877
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55877
Patch
https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1
Release Notes
https://github.com/symfony/ux/releases/tag/v2.36.1
Release Notes
https://github.com/symfony/ux/releases/tag/v3.2.0
Vendor Advisory
https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84
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